We didn’t live together. We kept in touch _______ writing often.
| A．with | B．of | C．on | D．by |
______I open my mouth, I put my food in it.
| A．At times | B．Some time |
| C．Every time | D．By the time |
The computer system suddenly_____ while he was searching for information on the Internet.
| A．broke out | B．broke up |
| C．broke in | D．broke down |
-----How far apart do Tom and Jack live?
-----______I know, they live in the same neighborhood.
| A．As long as | B．As well as |
| C．As far as | D．As often as |
-----Would you please repeat it?
-----Obviously, you _____me.
| A．hadn’t listened to | B．were not listening to |
| C．haven’t listened to | D．don’t listen to |
_____ I admit that all these problems are difficult, I don’t agree that they cannot be solved.
| A．Unless | B．While | C．Until | D．Since |